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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07feb4bbae994ad1bd83bb6b4b60ae0b9b1c10790c444e7532ac13af12e2dd7' 
  AND token = 'lzK/n8EJyVKaHmZaKQ2P6vj9uRpTtzufj4vguMJ+MWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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