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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d9ad446b400688710daa493ea327a2225b6112c3a0fcf8250f5083167692d0' 
  AND token = 'VfYQL4uD/KlLMWrDgfBuBd2mKH8lbzpi4A95eH8E8zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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