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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7f8d9758bdf3c3ab128f6dfeeaf3a18d5026eef0d697462396a397ae2e649e' 
  AND token = '9zqxiqkS/WZ7UaJDjf37jxoMxxVZm+Rap8GtLdfcWy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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