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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4997ccc44a669d78d4f3a0b296ff0debcfef41917560451cb0dbded2d51e7eae' 
  AND token = 'y6uYh5HqzjEsIdUuNqkLo4+t3zo5FnPLabDLdPwI/eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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