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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5519f52b9752760e8d7bec06c8b0f367e29a555787bae49230a9a7dec5f9996c' 
  AND token = '6a5KdCmJwuYEad6mJAdmB0shT+6ClfUkhL2FpPCsQjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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