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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc2d4c1f43ccd9234ba3abeb380f2fb8508d77f33bc7d55b4128461e5237d96' 
  AND token = 'Scy3dJzpclecmwkqs8MmpOLAZgt+3XwYp/bBlXAPXc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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