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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ae3b13671ea311be811e17248da60e72515ff61a5903a671b9637329832570' 
  AND token = 'HM2g/ZTZHzNCk6RRfvTAEv7YZzdwk4AKV9PSrZpbbZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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