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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc773ddb8e355a1b2b767a0f814ee54f0b65061357b76f2b7e0d1a523c897c99' 
  AND token = '4bRYKmJaQIfZc2wMZen/vJpertCuyuVh0ZMbc4qV89w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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