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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0788b1644b0e3d701a18c0cebdccc4383b411f7cfde5b0793999bb41d5b992' 
  AND token = '3Qq13S4/8UNycaUDUK3J0X3xore7mx5Ohho25vd2trs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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