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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8757ff31716fbf14f9fc06e0ea50cfb43fd89413c90eff0a861ea215c4c83d3e' 
  AND token = 'Qym3KDkRFiKzDemH3ZB35bSle8iiGhguFDUDo81b2dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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