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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abf7e93378d641ea6dda7da0cad4b363720247134b678a96a134cf4479b9eba' 
  AND token = 'oDAna9qy20LspaRGmwfT1Nh4HbRIeyUmlxQEQGV67VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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