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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd55d8498c8601279966a629b3552c10303f57383bcc077401a4a811e433d42' 
  AND token = 'mlmDgwprQ99zOI4cDrRcw6+reg4jvozJoqh9j9d5dy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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