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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8981666e11570b4b9457578c3848c60636fe08f69ec5054dc5393edde5d97486' 
  AND token = '/M8nWobo7shU/F77Cp608tjBCF7X3hBlbQIRsQIIpdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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