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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030b8332db7599c7a392a879f87ce11ab924bb6bb29aff60362cd0d4b4b1113e' 
  AND token = 'S24Rgebu88PlhLKsHAF/b+G9nc1P7llgDIg5lDMSlCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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