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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f291561cf5e1a5e285e47757343ba2140507ad38499cfbc21fd141b4fcd574e8' 
  AND token = '/2DLdtoJRWRkOp3U84inEjLVmu5gd4VmBvAosqD6kz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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