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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8f469e3ac4aed765e4349b18d9bcf68f1f8883d8473fb5f2f1a7a6de30e56d' 
  AND token = 'nOnDcXORa1MmuYK0oxEuYJIkxf2/bqMAPjWbWDwZQko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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