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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7a5b9370ce8286fa1308d68eecc0a29686691ccd82e21afdfc5c69c203c34a' 
  AND token = 'pGuChiEV7GftLZLgVhxVATMUY2sfFU1axSZeyVnpgGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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