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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48fbd253d8e8354970e7187fd20ccfdda02ef7191bda053f8c541d043e842bf9' 
  AND token = 'DwbvMdj4Mum6/FXtAy/LLDnLmsM8dNP6OlWoUg4zQ6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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