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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e12b5a5e2a7e6b8e6c786e5c708cf098d6d13c6e9dccf423b3f571735f42c9' 
  AND token = 'd7QHJq2o1vh8YNEe6tawB0Bok9X/cNXAPJnJVouK9NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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