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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fcd4d1dbfd9ecd97bd2dc86b84976ae2783becbb187f90a32649b678ca14206' 
  AND token = 'peV4KnUefw5wSEHX98A9I1oAb7EkMSbru2nSWj4OmSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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