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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5c1525277aab25f5b7ad713ae75c27919321721ac9c06ba759bdb12af92f40' 
  AND token = '8DTa196QjeXB+ozV1/Ei+8RrlKCFaP3y7u1roTP49BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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