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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1b97d4ab507fcbb95281bfbf83a9d123c1b5fc46bb11ad1cb36022a3c61bed' 
  AND token = 'iz819w3/qKQab/q4T0RmqyQfN3aYt3PNVX7Z4++kEzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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