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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12194d735d7dca1b1c8be27e662844d7a19d6a337776a7b9cb92c89dc7bdfc6d' 
  AND token = 'v82PB9PLGk/0famlh48gqIeoCJZyO0OAwzTi/ayszNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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