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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c20572f45ae01d40a9a7f7e6a695c55d2d7420cced72e1db97b668f0aa3939' 
  AND token = 'o1fc1KeUZJN3rYi7mYJcAFRZ+KviVGHEy6GsYpTa78Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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