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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f262f8e939ab992dc6f96068d81144998222d6f7fbebc0c6789cd305ab80f4' 
  AND token = 'MHErt24z4nbzc5BxPg6aZ2129GexbE5Ou2khJBrY85g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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