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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3813bbe4a980860ff46776941d9ee3422cc863c29e765abec64a34a996093c73' 
  AND token = 'jG2j+v+NoxZ5xbykM6RfDxRS1ceiyXd60TU9UTV9Gr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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