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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8b1e93a6e3fa848cbb7ce97e709da5fbe9f5572a16a6473d7ba9f4b9030101' 
  AND token = 'k4188+tjsq/V+zzSme3kkQEwtQGBGs/T9BwmDc32HQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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