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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02f2a0cbe5a67d136550f57c6a0573b2b9c848aaf3357538f05ef3732fb70d2' 
  AND token = 'SToZ9Z9F4gnxQvxMh5JFc0mkVxoTKpDgQCkSSZih0oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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