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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b794cdf7bf777ee5550bdbd30c5ce97bdf819c4e4710c9e9eed1d6c76d9b9970' 
  AND token = '3tmPixyFv2oYJZL4wNFQ9bsLxlYMKqZ1+xvLDqI3x0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}