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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ced4b6a4e5882c198f5f3261b1f06b5710fc69c96a682555cf852f1fe0c143c' 
  AND token = 'QCxeaAlbc9VnOpFTgRe3nhoLDixmegYGJG+NtkIpj4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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