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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23dbb1762ca7ab24311a08c8d973819adedb11303a16975138114ed52c07731d' 
  AND token = 'Iq906H0Cfae2OnmhqFdtPhDGdIP95+ruCo5SBcMTuDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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