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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b82cd24207f327f8256cb32ecab258ed4eaad36b1100ec15a7a0c2a047a8cb' 
  AND token = 'Wb1FECueQrENDBaPkDXyOX4DJ2aimUQkHxRaE8Dqg+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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