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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d6b5060da7cf15e0836845b148bb99c927f8fb8f4acfbbca641ffb0a6b7428' 
  AND token = 'urg5Kt8NzbSYLSutEebIxH/d49M+3/RhO8XAxRMoubk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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