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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b8f24872a63b886953d935c3fc7df39ca753bc57aafad84726ab010087104e8' 
  AND token = 'tj5w02KG9ahkbg1tr/aFCwrRey9s1Lh6WRO/8Jo2FYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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