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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'defe8737d059f04ccde517ac8b85c5d4316182ab73ca2fd3c53268a7cf818375' 
  AND token = '2YC7z0/lm9pi5K/BMOdtAnZZ7t6eNK2z5Z8oT9HwL+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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