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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c4bfd23c43a1aec0ad18557dd8261e7cbd774c8a9d7821b27a6d0d3fbab974e' 
  AND token = '2QGgPNd87/gpDzNv2oB3C8iQ0281Sfzy0BoWQfjs3V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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