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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b6f60e43a440f4644a15a6795a36ac2c8441d2d22cd2de52f88f48a60de54c' 
  AND token = 'bYOHd+YSrUfX7e4PV++Via3AR2xKR1pbxP9w9rTNl3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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