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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9cad98bf67178bdfeea69b6f32df1d66df22275793c8f555e43a873339aeee3' 
  AND token = 'bFpJjVQaA3bNJ4dpVtS2dBzQ9bT6SyJZ9dWsgYbgdNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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