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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9034d1bc573692af0ee51f9a365b601ca0f29151c17cb15389fdc731e027fa5' 
  AND token = 'VXfzlAcjjrs9AoTkx/geUdEjaB5o1DwSxUzGzpYQz1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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