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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b830225a0c9773f1f8cda2e6220713d33f422b4864758d5d3d2d2de84746a3' 
  AND token = 'sWZrZ1KiUpswQLCFp71Hm6kFmprgL2ymPtWYBi7jcWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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