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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a302532bde653d9a9be1b3fe2503c875d435224817350e637dca1d7b5dbd35c' 
  AND token = 'C98JEsLmt42Zn++vz6Qk/CaA0d1495yAW4P5u99NEEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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