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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a277a77a6390b0c18351c26a91d638163682154258b93526fa94a856c7dcc11' 
  AND token = '3OtEAPGK/rsTiVDbnOJj5Q5Za4s8jJ/oo115as/DADw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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