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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7598a1ec2e3881a79d2be00c499ec2cca9a850a3e439bbfb62dce37d4a7702d6' 
  AND token = '1rTH4/vuhVJ4sbN+ZRw9WJ4Udns9tR+Ax61upMdlluU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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