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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9862b589126acf2d9e366ecfdcb810dfb51d1b14905915edb71e6bfcf801de' 
  AND token = 'MsSBbrw5Wfl0lKpmWnNlZSSGCYxs8uWRSefDm45zndU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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