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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31661ed92f301161e0ee1f2c6655b383d8440f184cefe9be45b1487c436ccf54' 
  AND token = 'lrwkR/bVVHBNmgKFbNXiBlBS6CWekL3OLYjPvZ2tDYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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