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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f765cbe5dc066ac24c3d68d825357ef7fc41cf67894660e4dd4f091f6d36e21c' 
  AND token = 'ai2cvTgT12zTS4HSwmxDfBk8s9/Rtbl65oPi0TOeEDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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