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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14417a006c3e8bc6e3bf85a20b7a612ac5ea79fb58efcbb787072732ed5eb93' 
  AND token = 'eb7KurFKPrTfVlicnJlbjBUuY6J3+r2rlpuGZQCr4HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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