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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e128c7fd92ef62760a1f9a22caa9e85691e94fa2320a052e32ff20e1e7db48' 
  AND token = 'BpFprXS310c/Y9yZoxgnzLfUXnll6s5CRrjpiUaiUJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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