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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3544f094b7d4090324825545354c9895e3739bbf4c8707dc23746afc2c45dd2' 
  AND token = 'QFv+xIzCXwej2G4wewynbiv+h8OrGxAq+Jc4ck70foA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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