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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e916559775c7f4706c1c140ea0402d56cc0a84223f09c23e55e8e4feb5fd6e6d' 
  AND token = 'rvA7eMszw4kJw/KoFIkyHIvtjFPPa4gjGj6wYdvih9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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