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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c2a2f9d5ed9e6206dcde6526e6040e3dd58e6c9c88ec72e60fe697edf295f0b' 
  AND token = 'pJII0MCb+TqWdl5KIQA4WdJxpIk8Trukgmqj8+b1He4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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