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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e56f1480626477f2f3d6be73291e7dbd1af0319896bba649d9399c2c84c9659a' 
  AND token = '8wHX461wmFMs3+Wm4je7lQT91J1au1wc1jO9NXFrwSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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