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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb6a70783defe1ca28ffcf9fe403892dfbe58b815283ea54ec04ca9909cade5e' 
  AND token = '1FEaDqn0JKqfRL479pSaTDBuLTUGPybjGhGoxPEqR/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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