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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '288e405c98fb0e41eece9598e58b81748b9c5bf6c10bd1f15e2845a7cc5b30b7' 
  AND token = 'SZ9/E7DnhKmbYtDPCHdVm5mXw9Zzlhfl7CAS0HFmlto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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